Process of making antimony compounds.



' mony Ho Drawing.

currnn sa'r PAUL BOESSNECK, 0F LEIPZIG,

- 0F LEIPZIG,

GERMANY.

PROCESS OF MAKING ANTIMONY COMPOUNDS.

To all whom it may concern:

Be itknown that I, PAUL BOESSNECK, chemist, a subject of the Emperor of Germany, residing at Leipzig, in the of Saxony, Germany, have invented certain new and useful Improvements Relating to Compounds of Antimony, of which the following is a specification.

Antimony'oxid, even in freshly precipitated form, is not dissolved by acetic acid or sulfurous acid. Even if a solution of anti 2; mony trichlorid be precipitated with caustic; soda and then sulfurous acid introduced acetic acid added, no antimony oxid goes into solution. Fluorin compounds of antibehave quite difierently. If a solution of antimony trifiuorid be precipitated with caustic soda and acidified with sulfurous acid or acetic acid, all the antimony oxid dissolves again. It is obvious thatdn ,this reaction double compounds of alkali .at will, thus for ,fluori'ds with antimony sulfite or acetate are formed. The same compounds are obtained, if sulfites or acetates be added to solutions of antimony trifiuorid, or if antimony oxi in the presence of alkali-fluoride. Owing to their unstable composition these double com-- ounds give up the antimony oxid to textile fibers with the most extraordinary ease, and upon this isbased the great technicaladvantage of theiruse; in the bath there only remains behind the free-sulfuro'us or acetic acid, which does not attack the fibers. The proportions between the antimony and sulfurous or acetic acid may be varied example. all the fiuorin of l the antimony trifluorid may be replaced by sulfurous or acetic acid. As the double compounds were, however, hitherto only obtainable in solution, because they are easily del composed and easily give oii sulfurous or be dissolved insulfurous acid or acetic-acid p acetic acid, it is advisable -to employ solutions acidified with sulfurous or acetic acid. For example 126 parts, (3 molecules), of

sodium fluorid are stirred up with 1000 Specification of Letters Patent. Application filed October 15, 1909. Serial No. 522,761.,

Kingdom 1 tion takes place.

Patented Mar. 22, 1910.

parts of water, 150 parts, Q molecule), of freshly precipitated antimony oxid are a ded and sulfurous acid introduced until solu- Or- 150 parts of commercial antimony oxid' are dissolved in the theoretical quantity of hydroflupric acid and a solution containing 400 parts of crystallized sodium sulfite in about 1000 parts of water is added and acidified with sulfurous acid thereto. I have found that are obtained where the substances are adde together at ordinary temperatures. hese solutions must be kept in closed vessels, preferably in wooden casks, as they otherwise decompose with evolution of sulfurous acid.

Instead of preparing finished salts, the dry powder, as for example the salt ssbFueNmFL may be more conveniently mixed with the corresponding quantity of dehydrated 'sodium sulfite and some sodium bisulfite or sodium pyrosulfite added. A. powder is thus obtained which contains a definite amount of antimony oxid, and which dissolves clearly in water with the formation of. the desired double salts.

The compounds are suitable as substitutes for antimony-salt, tartar emetic and lac tate of antimony.

What I claim is v The process for the manufacture of antimonyco1npounds containing-the whole or a the antimony oxid in combination which consists in dis mud in sulfurous acid part of with sulfurous acid, solving the antimony in the presence of an alkali-fluorid, substantially as described.

In testimony whereof I have hereunto set my hand in presence of two subscribing wit nesses.

i 'PAUL BoEssNnoK;

\Vituesses: v

RUDOLPH FRIOKE, SOUTHARD P. WARNER.

the best results a 

